電腦斷層掃描檢查提供臨床上高品質和三度空間各方向、角度與切面的醫學影像，給予醫生在判斷受檢者的病兆上顯著的幫助。相對的，隨著掃描切片解析度越來越小、檢查的頻次越來越高，掃描檢查同時，受檢者所接受的輻射劑量與健康危害風險也日漸增加。有鑒於此，致力於研究電腦斷層檢查對病人造成的劑量貢獻並設法降低輻射劑量與改善醫療品質為目前國際間熱門趨勢。
本研究利用蒙地卡羅程式BEAMnrcMP建立一台電腦斷層掃描儀模型，對此模型的照野大小、射束品質、劑量特性進行驗證，並完成了螺旋掃描模式的模擬，確認了臨床應用的可行性。另一方面，利用圓柱形與擬人形假體的電腦斷層影像建製成數位化體素假體。最後將假體代入蒙地卡羅劑量計算系統，分析電腦斷層劑量指標(CTDI)，找出合適的絕對劑量轉換因子(normalization factor)，進而計算出擬人形假體的器官劑量。
以建立的蒙地卡羅劑量計算系統為基礎，作為台灣電腦斷層掃描檢查器官劑量與有效劑量的評估極具意義，對學術研究與臨床建議都有顯著的價值。

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